Hi ppl, pretty new to maths. picked up a discrete mathematics unit this semester at uni for something a little different. got a quick question.
Question: given that n is an integer, prove that n is even if and only if 9n2 + 4n - 11 is odd.
Now, i already know that the above is true. just wondering what is the general accepted format to answer this type of question? i dont know what my answer is supposed to look like so could someone maybe do a quick demonstration proof of this question so i can see how this works?